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#include "opencv2/opencv_modules.hpp"

#ifndef HAVE_OPENCV_CUDEV

#error "opencv_cudev is required"

#else

#include "opencv2/cudaarithm.hpp"
#include "opencv2/cudev.hpp"

using namespace cv::cudev;

namespace
{
    template <typename T>
    int countNonZeroImpl(const GpuMat& _src, GpuMat& _buf)
    {
        const GpuMat_<T>& src = (const GpuMat_<T>&) _src;
        GpuMat_<int>& buf = (GpuMat_<int>&) _buf;

        gridCountNonZero(src, buf);

        int data;
        buf.download(cv::Mat(1, 1, buf.type(), &data));

        return data;
    }
}

int cv::cuda::countNonZero(InputArray _src, GpuMat& buf)
{
    typedef int (*func_t)(const GpuMat& _src, GpuMat& _buf);
    static const func_t funcs[] =
    {
        countNonZeroImpl<uchar>,
        countNonZeroImpl<schar>,
        countNonZeroImpl<ushort>,
        countNonZeroImpl<short>,
        countNonZeroImpl<int>,
        countNonZeroImpl<float>,
        countNonZeroImpl<double>
    };

    GpuMat src = _src.getGpuMat();

    CV_Assert( src.channels() == 1 );

    const func_t func = funcs[src.depth()];

    return func(src, buf);
}

#endif
